ADATA Ultimate SU650 1TB vs PNY CS900 1TB
On the measures that settle this, PNY CS900 1TB never comes out behind, and on at least one it comes out ahead.
| Specification | ADATAUltimate SU650 1TB | PNYCS900 1TB |
|---|---|---|
| Capacity (GB) | 1000 | 1000 |
| Sequential read (MB/s) | 520 | 535better |
| Sequential write (MB/s) | 450 | 515better |
| Current best price | £138.60at Amazon.co.uk · captured 2026-09-13 | £119.99betterat Amazon.co.uk · captured 2026-09-13 |
| Price per TB | £138.60 | £119.99better |
| Warranty (years) | 3 | 3 |
| NAND type | — | tlc |
How these two compare
Sequential throughput
ADATA Ultimate SU650 1TB is rated 520 MB/s read and 450 MB/s write; PNY CS900 1TB, 535 MB/s read and 515 MB/s write. The SATA link tops out around 550 MB/s each way, and both work against that ceiling; the more telling differences between SATA drives are how each holds up under sustained load, whether it carries a DRAM cache, and how much writing it is rated to take.
Price
ADATA Ultimate SU650 1TB lists at £138.60, or £138.60 per TB; PNY CS900 1TB at £119.99, or £119.99 per TB.
NAND and warranty
NAND: ADATA Ultimate SU650 1TB's NAND is not stated and PNY CS900 1TB uses TLC. The tier is bits per cell — SLC, MLC, TLC and QLC from one to four — trading density against endurance and sustained-write speed: QLC is cheapest per gigabyte, TLC the mainstream balance, and the denser the cell the sooner sustained writes taper. On the cover: ADATA Ultimate SU650 1TB carries a 3-year warranty, PNY CS900 1TB carries a 3-year warranty. The length is the maker's own vote of confidence, and on an SSD it tends to track the endurance rating — a longer warranty usually meaning more rated writes.
Which to buy
PNY CS900 1TB. It gives up nothing to the other on the measures the site tracks and leads on at least one, so there is no trade to weigh — the sections above show where the margin is.
Common questions about this pair
- Which is faster, ADATA Ultimate SU650 1TB or PNY CS900 1TB?
- ADATA Ultimate SU650 1TB is rated 520 MB/s read and 450 MB/s write; PNY CS900 1TB, 535 MB/s read and 515 MB/s write. The SATA link tops out around 550 MB/s each way, and both work against that ceiling; the more telling differences between SATA drives are how each holds up under sustained load, whether it carries a DRAM cache, and how much writing it is rated to take.
- Which costs less per terabyte, ADATA Ultimate SU650 1TB or PNY CS900 1TB?
- ADATA Ultimate SU650 1TB lists at £138.60, or £138.60 per TB; PNY CS900 1TB at £119.99, or £119.99 per TB.
- Should you buy ADATA Ultimate SU650 1TB or PNY CS900 1TB?
- PNY CS900 1TB. It gives up nothing to the other on the measures the site tracks and leads on at least one, so there is no trade to weigh — the sections above show where the margin is.